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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4028233e9709c155bde5ce1f786d2cfd2c53ad0ba74e89c26c733ee93cc8750' 
  AND token = 'C2/M60C6urTgX7m+m55W62xFy0RBYwUjYWwTU2iITlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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