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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0866333c9f19fa80fd493a7bf52523ebf070ed0d270fce9214ea208186125d2' 
  AND token = '1gkAE/Qnm9L+FlHPpHSwqbS47b4h7YXZ1s6kjT0sIXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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