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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db40c8eed9c68f05fd4d4e5823760311f3a452a4eaab25de3e040543acc442d7' 
  AND token = '2dB0fwYhCoho9nOpoMhgd6P6A1gnDCK2VK+32lNxk6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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