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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c9abb670537ea900523b6981e29d1fa90b5dc9f1a8baa08b4a154a62f74eac' 
  AND token = 'ymh7asNlpbtEWSk6o14x2czXqjXxpF1QeE9Qn+xWKW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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