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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38ba296b43f363ea09cde891af8a111f425848dc32751068a6c72681afd4c0f' 
  AND token = 'PW9QbUZZoGQ5H4VaHp0AdVC1ue3AgJXT7Xks612G1sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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