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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fd965cae2ddf29e50453bedbb4d2e5782145c0c4a17891088461f5ab6b66ad' 
  AND token = 'Cj+RoB8QV5BOva29XTbJS3fJTifINH/18SAvcgRIcr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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