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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205fe7595af639152cd4fa6655cf6b368280c9dc6bf7ea1e803f5e1c28f25bcf' 
  AND token = 'Swc+O48Q0Wzy3t6XNH9+pG7pX/zcvu+2CdYCHAowsQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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