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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53a181c2c32ac4b68adc8594d0c158e7f7f1a9bc391d0763d80a8df178b578f' 
  AND token = 'GCMA4EqDo+0N+/R5/DI7E48vpvH9nrtrU921K/HTJNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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