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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b19c34da35524cc9072d9cba5aa68640831c18b90c17526fd3b1084d714a4e' 
  AND token = 'En/DQYpqByJLgeVlsdOu4d/GZy3Tux/sGi76q2NDNVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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