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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286050f5ab536f50ba0a1d46706e8deb650575c8bb5dd8d97002a2c4cf62b71e' 
  AND token = 'SMtej2B2NFuVgbc32mVJPIlHGNi6HXx2VUD1Upvh048=' 
  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"
    }
  }
}