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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287ed5a9346f801c8d379293bf7114dbf80e7467997ab79a7181378c981faab5' 
  AND token = 'nHaJe59Z8vTN/wiCv6IfyG2y4//9if56zPq2zNEkbz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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