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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7153fe82975312792ff109fc0ed9da79d1d60b24dadfdd23984e56770f08bc07' 
  AND token = 'FNNsw4RMLQEI0/3LY2G7Jm/f8LLAROkOEm3ys2oR1Lo=' 
  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"
    }
  }
}