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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f810ffa5de26857a0b137f8a6be26b334662a004b5f67e80617fdef5b0e11fb1' 
  AND token = 'z0nZURrgz3zGBCPR+9QnFxOBY28ALC9cAL68Lc7n2zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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