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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f42c07b184eb7d75dc52706b984c2fab51d62eb0e74e516b204d0219d258f13' 
  AND token = 'O6QDB5eRv6KsUdDNM/x+DVTI3Q4is5vlP1+nfjltZwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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