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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09c792d7033e772cba02cc039d1243f3d7f8a86234209611ce8805d5ad66cf1' 
  AND token = '40ZbIsqVV7mhGqRk4Xph+O+t+nipfzwX0FKfkEgd4Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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