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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b6e895bb12ee1b0e5ab6cb2f454dad68f9c07058231609207aede3877350b5' 
  AND token = '6StNiUjihsa+VhidlBRDPpKjv3DttDCrfm795iwdy7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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