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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8899839675d3ef82aff3d2adff08c44ba9caadf8fbee31b6b3b13e75df0895' 
  AND token = 'XJgSatKFp0B/xpfEiciM0WInx8J6h8xsV3HsbNyJkHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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