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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e3d27f4e11abd978be264e2c0112f03ec098ed6f00e601276a93a90795f444' 
  AND token = 'SRNb4h8ZOQ6X2aDU6UUvszQudxSOXRea+WPz0IVbTnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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