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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1951860fe29e2d93b2e44e592efb26ffff94f80f8d3a303832a1a4ff9be8cc1' 
  AND token = 'OYE0iPxRwPFglgvEvr59YLE/BfZ/k6WqszrG/AcCr1E=' 
  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"
    }
  }
}