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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b628d1ff42e22f9ae14b3be2be52e95d02cf837d69adcfccd1efb9f89a84592' 
  AND token = '6AgRp2BNScZ7ru1DOA7QnaodYJuEBP60Wy5URGTKk4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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