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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a976d1aad155d89e372d693826511a1311ba7e9d69850dfd09b488b0dd330f' 
  AND token = 'vyg9VNcxH/gHKKumizf7tAFFFA7akjY0D3CuqGsatmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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