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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9ed35ea8a93a0985e5bd7972564cd128b59128a6bdcaad26e6f1a3f8b47313' 
  AND token = 'kBLopjBQ6CDsCtCjwJRWyrxU1/IZm7sunST1Ya3Y3Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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