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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58978f3f4c1ff786d2a165e3fe940056eaa644d22604c284e835f4aee7ef97f7' 
  AND token = 'Fhmev9jJIyZboH/vKtmKFZnfY6qaW6tudkxaN3i/MC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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