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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d424bbbdbd7a6d50a7f0dbf85ec3920009eb8b21fb7df3ca56dbb598a652cdd' 
  AND token = 'o1tquIzfGVGAgPrSbCG1qMIYX0PwFV2N2r10He7fqcY=' 
  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"
    }
  }
}