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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c61228c1e9cb8b4bac77dd286e9cf692952b2ddaa5a0896862fbf2c8a14f3d' 
  AND token = 'V4jke6Ny1S/LP0RsUtXqSmdX1E1R+jfd8E/cGCyzYdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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