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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bb4af446280fd2fcba77eac5f7f562f209117f41dd982a5a5fce4ee93ba3c3' 
  AND token = 'dXiYDwNU6nLfJDNyGg+9Fju0QpAPKNv6Q424obaE0VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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