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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c299e16bc2a071f481c0367b1d759d6189f5c749ece5aa6d00b5714040bb02b' 
  AND token = 'PwFTIGwkfh8ZgoWos5xV2rzR13pKz6McdQj2zpjTg3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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