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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41313b803c1919dff3fcc18f14731ef5fb0444b7b31cdfa63250699f5fb960bb' 
  AND token = 'zYdH3iFTi68p0It8/+k9+naL/dNWgxpXDT2oOsE9+I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}