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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cf50fc0eb310b90448d1e8eeb3c7e3c6b938894e68f41186ec90401c26a294' 
  AND token = 'MN0gGgMo0tX6n0+FXUB/3HcgXOjfxSYM39N4niDy3iA=' 
  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"
    }
  }
}