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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076bf59f7ee233fec2eb051232a88e50caeeeda9a5b41872825a422ca2b38f98' 
  AND token = 'p0rntwcX9Ih3klYILofWJEKDgK2gCThEonwGO536fQ8=' 
  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"
    }
  }
}