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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc56460b9da0dd989b173619057a6baa332cd9b9c2b96f025c3a665a31e1a1b0' 
  AND token = 'tJJJLYE1ndxDiHALTk1uCG+QT3z8hXR/JO7Km9l9Dy4=' 
  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"
    }
  }
}