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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ab0002e46f3a9adc2aeb04699c75e5233e398d4ba6abdb3713e851ddfa538e' 
  AND token = '8KzUE70gM8a5qLtCPS9Ers7RKUiljg85PtS6dXoO06U=' 
  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"
    }
  }
}