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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4d2d6a16af16f9259e6217224602f44e87fcdd5e080986d9f58c9f55e2e7c6' 
  AND token = 'C5Jc9oXDPo/FirXiu9rayiHi/ZcXDL1nPq10z1t2FYM=' 
  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"
    }
  }
}