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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01412cf713a345edcf243a0fde120722738cc08c89e5666e16368d5376c2595' 
  AND token = '3Pk4KTXMRDKVwbcijWqrXcp3BxvVTqv5fyaGNAFhbUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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