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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcf09f1bdfbe154a5412aafef62fd0b8a208470d7092135067945074f31cf90' 
  AND token = 'DVoIN9d/VVs/IIShF3qs73bXFVt7Bs5Us8lBg9giQfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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