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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f25653e3dff25442149e47610659004821248c3b992be7645c516a6cf03d95' 
  AND token = '6Qs+Xr4o8H1cPXFGVMbyLKa/3SpCeQfFsr5PlzxE57U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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