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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707c8a8c91f08de87c71cf6c3ffc29c507cde35756b2ffd78a9e2aec8470ce2f' 
  AND token = 'FHrqLSuTXFQ/+tpydZsnG7YQ61pO+L4w4r32rb1HyzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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