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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78f7bc3f04be1dde3d7fae14eed3d3aa2f4fe19d455f4cff564235f2b0f7f05' 
  AND token = 'xRuZbGprl6dpU7bx0g47YopsZ1l5lZx2a7RkbC1kTpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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