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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3890eb9c02043ec5c834bd03d005a6f1ae78d9a17410d3368a3760da13637f' 
  AND token = '60Q9ILVNRrQQwZaJsF/ia1kCLa0ln8NaiLC+Yl9TsrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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