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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4a6e590dbf4a3b787178998bc3cc44497f4ab3ef290edba68b9ad0bfc5c3f8' 
  AND token = 'awMaekZzskpQ6PDZF+2j14EoKVzgXZ7tNNaRI3p8Mfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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