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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975edc2cb1b61c8ca4e4f32aedbd897450ff6b00ad052bc5ac8223e72b85b955' 
  AND token = '5kvZCWhv89KtGYMjZN7Jv/CYfe8+4cf9CkNLaJb6diE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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