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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c175f494b4eaea8b1e3cfac10c665b886b067a20aae8cc8bc3b1b8ea57eaeaed' 
  AND token = 'PGoxC4RFn6p3ntCOdxt998ZZFKmS/MzSt7LzDh07G80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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