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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6797ffcbdb41f054b651f914aec136184c367e922b2c8dbf5f7c1d5e18998c' 
  AND token = 'fI2X0SPEKEQ8ox0otf2UuylXBrsxYPyTQP3wa9lbAoY=' 
  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"
    }
  }
}