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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e93c6aa8e38ac094e7b38bcad4338dccda420cda2268bb889e79ebe60a3cf96' 
  AND token = '7x3L0Ti3pv5iMxY8m/ZtEonsptq44w4Sm8bS1DsfvxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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