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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16265f0610a0c6c8aec64cd0cecf6c333101375a919cae63cb7d18a94dce1a3' 
  AND token = 'k6bQ1qLGVqKe8wgzp934+mydnilVJ3+lP4JG/ORjrq4=' 
  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"
    }
  }
}