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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62cd3504aba76da44da1d37fedcf6c3e04b0072d76d362ee1369f6f33a6aa079' 
  AND token = 'hXo3ncWb8v+1/OzsPWbblE2KOh8T8k4FdthbJ+5ZKWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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